Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02cd0eb556b57bc…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 19:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1885490ea96761cea2775b597f70e80 SHA-1: 319683b4c48c6843981d1636e140a9e97af7df93 SHA-256: c02cd0eb556b57bca989d4ba7840bafe732efe903f7fb66a800f0ada780e0232
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or appear to be part of a link farm on disposable domains. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=edit+word+online+android PDF link annotation
    • http://vstarmp.cn/upload/files/20210911_092857.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/30702382781.pdfIn PDF document text
    • http://aurora-c.jp/files/files/57712493687.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/86617539481.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/23676064304.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/95414890220.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8c1de70d---wimudup.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/37982015247.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f6d0e71abe05a4f68bc905101ddb2514/67696484136.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210903035231.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613840b292d51---78471346288.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/49597614785.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/gurodi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e85098a903fe64adead6b8c3b5323a0e/47930334101.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/modasoxilo.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/tefabirututajogubejasa.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/gekekorolimite.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/siwapexafitomofizibufiva.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/rabofejamivarakubi.pdfIn PDF document text
    • https://ebooksweb.net/files/file/keferubatatijikejo.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/lesakofisip.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/55867028778.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/sularexafene.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/73643216574.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/24280431126.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 17824 bytes
SHA-256: 745eadab570d9339e9f32d2f427a7b14f728b73906211574661a8e3f822d84a4
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10140 bytes
SHA-256: 8127fa32f166612758e703435ac91fdbfb0870424cc9603bfe1c2b19211a26dc
font_02_sfnt_off00011585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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